Molarity And Moles

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4 Terms

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<p>Moles (mol)</p>

Moles (mol)

Moles = mass (g) / molar mass (g/L)

<p>Moles = mass (g) / molar mass (g/L)</p>
2
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<p>Molarity (M)</p>

Molarity (M)

M = moles / volume (L)

<p>M = moles / volume (L)</p>
3
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<p>You dissolve <strong>8 g of KBr</strong> (molar mass = 119 g/mol) in <strong>400 mL of water</strong>.</p><ul><li><p>What is the <strong>molarity</strong> of the solution?</p></li></ul><p></p>

You dissolve 8 g of KBr (molar mass = 119 g/mol) in 400 mL of water.

  • What is the molarity of the solution?

Moles = molar mass / mass ​= 1198​ = 0.06723 mol
 
M = volume in L / moles​ = 0.6723​ / 0.400 = 0.168 M

4
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<p>What are the units for molar mass?</p>

What are the units for molar mass?

g/mol

<p>g/mol</p>